Stars of Silver Linings Playbook celebrated the film in West Hollywood on Friday, at the Weinstein Company's special event at the Chateau Marmont.

Stars like Bradley Cooper, who brought along girlfriend Zoe Saldana, and Robert De Niro were there.

According to People, even Mel Gibson, Jane Fonda and Diane Keaton were on hand to celebrate. When Keaton walked in, an onlooker said she looked kind of confused. When asked if she was looking for someone in particular, she answered "No, I'm looking for a drink.”

Meanwhile, Variety reports that Cooper will be honored by the Palm Springs Film Festival with the Desert Palm achievement award.

The festival will run from Jan. 3-14. and Cooper will be honored on Jan. 5 at the 24th annual event. Festival chairman Harold Matzner said in a statement, "Cooper's portrayal of Pat Solution is a career-best performance that has created Oscar buzz and has audiences rooting for him despite the challenges he faces throughout the film.”